CN111592425A - Modified seaweed functional water-soluble fertilizer and preparation method thereof - Google Patents

Abstract

The invention belongs to the field of fertilizers, and particularly relates to a modified seaweed functional water-soluble fertilizer and a preparation method thereof, wherein the fertilizer comprises the following components: 8-51% of nitrogenous fertilizer, 8-40% of phosphatic fertilizer, 20-78% of potash fertilizer, 0.1-0.2% of trace element fertilizer, 2-4% of seaweed, 0.1-0.2% of AT modifier and 0.1-0.2% of stabilizer; wherein the AT modifier is prepared by compounding organic acids and alkylphenol ethoxylates. The invention adopts the scheme of mixing the alkaline seaweed and the major and medium trace elements, solves the acid-base mixing problem between the seaweed and the macroelement water-soluble fertilizer, combines organic nutrition and inorganic nutrition, can activate the growth of crops while fertilizing, improves the growth vigor of the crops, and improves the quality and the yield of the crops; meanwhile, the organic nutrition also has an improvement effect on soil, and provides rich absorbable organic nutrition, so that the seaweed and the large and medium trace element water-soluble fertilizer have a mutual synergistic effect.

Description

Modified seaweed functional water-soluble fertilizer and preparation method thereof

Technical Field

The invention belongs to the field of fertilizers, and particularly relates to a modified seaweed functional water-soluble fertilizer and a preparation method thereof.

Background

With the continuous development of modern agriculture, the requirements of people on the yield and quality of various cash crops are continuously improved, and the crop yield is improved by increasing the input of fertilizers in the planting industry. However, increasing the fertilizer input brings about an increase in yield, and also destroys the soil environment, so that soil acidification and hardening are more aggravated, the soil problem is serious, the root growth vigor of crops is not good, and the crop yield is affected, so that the fertilization mode of increasing the fertilizer input causes a vicious circle: the fertilizer input is increased, the yield is improved, the soil environment is damaged, the soil is damaged, the yield is not good, the yield slides down, and the fertilizer input is continuously increased after the yield slides down. The influence is more obvious for perennial crops, the increase of fertilizer consumption in successive years causes the growth of the crops to be poor, and the yield and the quality can not be ensured.

A plant growth regulator is selected for a plurality of fertilizers aiming at the growth problems of crops, the effect of increasing yield and harvest cannot be achieved when the regulator is used for stimulating the growth of the crops, the serious food safety problem is caused, the content of the hormones in the crops is increased due to the abuse of the phytohormones, and the harm to human bodies is huge. Modern fertilization technology adopts a plant hormone stimulation mode to activate plant growth, and the mode utilizes external conditions to stimulate the potential of crops to promote plant development. Although the effect is not as rapid and remarkable as that of phytohormones, it is superior to phytohormones in safety. The next step in the development of modern fertilizers is therefore the better combination of phytostimulants with mineral nutrients.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a modified seaweed functional water-soluble fertilizer and a preparation method thereof, wherein a scheme of mixing alkaline seaweed and major and minor trace elements is adopted, so that the acid-base neutralization reaction of the seaweed and a major element water-soluble fertilizer is solved, organic nutrition and inorganic nutrition are combined, the growth of crops can be activated while fertilization is carried out, the growth vigor of the crops is improved, and the quality and the yield of the crops are improved; meanwhile, the organic nutrition also has an improvement effect on soil, and provides rich absorbable organic nutrition, so that the seaweed and the large and medium trace element water-soluble fertilizer have a mutual synergistic effect.

The technical scheme of the invention is as follows:

the modified seaweed functional water-soluble fertilizer is characterized by comprising the following components: nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, trace element fertilizer, seaweed, AT modifier and stabilizer; the mass percentages of the components are as follows: 8-51% of nitrogenous fertilizer, 8-40% of phosphatic fertilizer, 20-78% of potash fertilizer, 0.1-0.2% of trace element fertilizer, 2-4% of seaweed, 0.1-0.2% of AT modifier and 0.1-0.2% of stabilizer; wherein the AT modifier is prepared by compounding organic acids and alkylphenol ethoxylates.

The nitrogen fertilizer, the phosphorus fertilizer and the potassium fertilizer provide macroelement nutrition for the growth of crops, wherein the nitrogen fertilizer provides a nitrogen source for the growth of the crops and promotes the rooting, the sprouting, the long branch and the leaf drawing of the crops; the phosphate fertilizer provides a phosphorus source for the growth of crops and promotes the flower bud differentiation and root growth of the crops; the potash fertilizer provides a potassium source for the growth of crops, promotes the transportation of nutrient substances generated by the photosynthesis of crop leaves, and promotes the expansion and coloring of fruits; the microelement fertilizer can be chelated zinc fertilizer, iron fertilizer and copper fertilizer; the seaweed provides absorbable organic nutrition for crops and improves the soil environment.

Most of alginic acid in the market is prepared from seaweed by using alkali extraction industry AT present, so that the alginic acid solution has alkaline character and is mixed with a weakly acidic mineral nutrient fertilizer to affect, and the AT modifier can solve the compounding problem between the alginic acid solution prepared by extracting the seaweed with alkali and a macroelement water-soluble fertilizer and improve the fertilizer effect. The AT modifier is prepared by compounding organic acids and alkylphenol ethoxylates, so that the acid-base environment of the solution can be effectively improved, the pH value of the solution is reduced, the compounding property of the solution is improved, and the solution buffering effect is realized; meanwhile, the AT modifier can provide organic nutrition for plants, can be absorbed by the plants after being applied to soil or can be absorbed by plant roots after being decomposed by microorganisms, can provide grains for soil microorganisms while improving the solution mixing property, promotes the microorganism propagation, improves the soil microorganism content, degrades and improves the overall growth vigor of crops.

Further, the organic acid in the AT modifier is one or more of 2-hydroxypropionic acid, acetic acid and 2, 3-dihydroxysuccinic acid; the 2-hydroxypropionic acid is a carboxylic acid, the acetic acid is an organic monoacid, the 2-hydroxypropionic acid and the acetic acid have a strong solution buffer effect, the 2, 3-dihydroxybutanedioic acid exists in various plants, and is frequently applied in the food industry at present, the 2, 3-dihydroxybutanedioic acid is an important auxiliary agent and reducing agent, and has an anti-oxidation effect, and the solution has a delayed coagulation property.

The organic acid and the alkylphenol polyoxyethylene are prepared according to the mass ratio of 80-90: 10-20. The alkylphenol ethoxylates has the characteristics of stable property, acid and alkali resistance and the like, has good functions of penetration, dispersion and solubilization, and can improve the activity of organic acid substances. The AT modifier obtained by compounding can adjust the pH value of the alkaline seaweed solution, stabilize the components in the solution, and play roles in buffering and deflocculation, so that the alkaline seaweed can be mixed with a macroelement water-soluble fertilizer, and meanwhile, the AT modifier solution can be decomposed by soil microorganisms after being applied to soil, thereby providing organic nutrition for crops, providing necessary conditions for the growth and the propagation of microorganisms, and improving the overall application effect of the fertilizer.

Further, the stabilizer is one or two of phosphite ester and neopentyl glycol. The phosphite ester is preferably selected in the invention, the phosphite ester is a relatively high-efficiency stabilizer, the stability of the polymer is improved in the using process, the phosphite ester belongs to an environment-friendly compound, free phenol, nonyl phenol and bisphenol are not contained, and the phosphite ester can be combined with other stabilizers for use.

Further, the fertilizer comprises the following components in percentage by mass: 15-30% of nitrogenous fertilizer, 10-20% of phosphatic fertilizer, 45-65% of potash fertilizer, 0.1-0.2% of trace element fertilizer, 2-3% of seaweed, 0.1-0.2% of AT modifier and 0.1-0.2% of stabilizer.

Further, the nitrogen fertilizer, the phosphate fertilizer and the potash fertilizer are respectively selected from urea, diammonium phosphate and potassium nitrate; the trace element fertilizer is a chelated trace element fertilizer, and the adopted chelating agent is one or more of ethylenediamine tetraacetic acid chelating agent, diethylenetriamine pentaacetic acid chelating agent, ethylenediamine hydroxyphenylacetic acid chelating agent and hydroxyethyl ethylenediamine triacetic acid chelating agent.

Wherein, the diammonium phosphate is alkalescent, and compared with monoammonium phosphate adopted by a plurality of water-soluble fertilizers, the diammonium phosphate is improved in the aspect of pH value and is added with the compatibility with the seaweed.

Further, the trace element fertilizer is an ethylene diamine tetraacetic acid chelated trace element fertilizer; the adopted chelating agent is an ethylenediamine tetraacetic acid chelating agent, the stability of chelated microelements is strong, and the chelating agent is not easily influenced by seaweed when being mixed with the seaweed.

Further, the seaweed is alkali-extracted seaweed obtained by an alkali extraction method. The alginic acid is extracted by an alkali extraction method, is rich in algin, can activate the activity of plant cells, promote cell division and differentiation, delay cell senescence, improve the growth vigor of whole crops, is organic nutrition, is rich in organic matters, can improve the soil environment and relieve soil hardening.

A preparation method of a modified seaweed functional water-soluble fertilizer comprises the following steps:

step 1: weighing nitrogenous fertilizer, phosphate fertilizer and potash fertilizer raw materials, and respectively crushing the raw materials into about 200 meshes in a crusher for standby;

step 2: adding water into a reaction kettle, adding alkali to extract seaweed and heating, heating to 50-60 ℃, adding an AT modifier into the reaction kettle, stirring, keeping the temperature constant, stirring for reacting for 10-15 min, adding a trace element fertilizer, and continuously stirring and heating for reacting for 10-20 min;

and step 3: dehydrating and drying the seaweed solution obtained by the reaction in the step 2 to obtain a seaweed compound, crushing the seaweed compound in a crusher to about 200 meshes, adding a stabilizer, and uniformly mixing;

and 4, step 4: and (3) putting the nitrogenous fertilizer, phosphate fertilizer and potash fertilizer raw materials crushed in the step (1) into a stirrer, fully and uniformly stirring, adding the seaweed compound added with the stabilizer obtained in the step (3) into the stirrer, and fully stirring to obtain the modified seaweed functional water-soluble fertilizer.

In order to avoid uneven mixing of the trace elements, the chelated trace elements are mixed with the seaweed compound, and other components of the fertilizer are required to be uniformly stirred before the seaweed compound is crushed and put into stirring.

The invention has the beneficial effects that:

the modified seaweed functional water-soluble fertilizer provided by the invention adopts a scheme of mixing alkaline seaweed and major and medium trace elements, solves the problem of acid-base mixing between the alkaline seaweed and a major element water-soluble fertilizer, combines organic nutrition and inorganic nutrition, can activate the growth of crops while fertilizing, improves the growth vigor of the crops, and improves the quality and yield of the crops; meanwhile, the organic nutrition also has an improvement effect on soil, and provides rich absorbable organic nutrition, so that the seaweed and the large and medium trace element water-soluble fertilizer have a mutual synergistic effect. The modified seaweed functional water-soluble fertilizer prepared by the preparation method provided by the invention can fully exert the effects of seaweed and macroelement water-soluble fertilizers.

Detailed Description

The technical solutions of the present invention will be described in detail and fully with reference to the following specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For a further understanding of the present invention, reference will now be made in detail to the following examples.

Example 1

The modified seaweed functional water-soluble fertilizer comprises the following components in percentage by mass: 25% of urea, 8% of diammonium phosphate, 62.65% of potassium nitrate, 0.15% of ethylenediamine tetraacetic acid chelated trace element fertilizer, 4% of alkali-extracted seaweed, 0.1% of AT modifier and 0.1% of phosphite ester;

the preparation method comprises the following steps:

step 1: weighing 25kg of urea, 8kg of diammonium phosphate and 62.65kg of potassium nitrate, and respectively crushing the urea, the diammonium phosphate and the potassium nitrate into 200 meshes in a crusher for later use;

step 2: adding 50kg of water into a reaction kettle, adding 4kg of alkali-extracted seaweed into the reaction kettle, heating the seaweed solution to 50-60 ℃, adding 0.1kg of AT modifier into the reaction kettle, stirring, keeping the temperature constant, stirring for reacting for 10-15 min, adding 0.15kg of EDTA chelated trace element fertilizer, and continuing stirring and heating for reacting for 10-20 min;

and step 3: dehydrating and drying the modified seaweed solution obtained by the reaction in the step 2 to obtain a seaweed compound, crushing the seaweed compound in a crusher to 200 meshes, adding 0.1kg of phosphite ester, and uniformly mixing;

and 4, step 4: and (3) putting the crushed raw materials of urea, diammonium phosphate and potassium nitrate in the step (1) into a stirrer, fully and uniformly stirring, adding the seaweed compound added with the stabilizer obtained in the step (3) into the stirrer, and fully stirring to obtain the modified seaweed functional water-soluble fertilizer with the concentration of 20-5-30+ TE.

Example 2

The modified seaweed functional water-soluble fertilizer comprises the following components in percentage by mass: 8% of urea, 10% of diammonium phosphate, 77.65% of potassium nitrate, 0.15% of ethylenediamine tetraacetic acid chelated trace element fertilizer, 4% of alkali-extracted seaweed, 0.1% of AT modifier and 0.1% of phosphite ester;

the preparation method is the same as that of the example 1, and the modified seaweed functional water-soluble fertilizer with the nutrient content of 13-6-40+ TE is prepared.

Example 3

The modified seaweed functional water-soluble fertilizer comprises the following components in percentage by mass: 13.6 percent of urea, 37.8 percent of diammonium phosphate, 44.25 percent of potassium nitrate, 0.15 percent of ethylene diamine tetraacetic acid chelated trace element fertilizer, 4 percent of alkali-extracted seaweed, 0.1 percent of AT modifier and 0.1 percent of phosphite ester;

the preparation method is the same as that of the example 1, and the modified seaweed functional water-soluble fertilizer with the nutrient content of 20-20-20+ TE is prepared.

Example 4

The modified seaweed functional water-soluble fertilizer comprises the following components in percentage by mass: 50.85% of urea, 21% of diammonium phosphate, 23.8% of potassium nitrate, 0.15% of ethylenediamine tetraacetic acid chelated trace element fertilizer, 4% of alkali-extracted seaweed, 0.1% of AT modifier and 0.1% of phosphite ester;

the preparation method is the same as that of the example 1, and the modified seaweed functional water-soluble fertilizer with the nutrient content of 30-10-10+ TE is prepared.

Test example 1

Same nutrient proportion dissolution test

Test products: example 1 modified seaweed functional water-soluble fertilizer with 20-5-30+ TE nutrient content

Control product: 20-5-30% of nutrient content, TE macroelement water-soluble fertilizer and alginic acid solution

The test mode is as follows:

taking two beakers, filling 200ml of clear water, adding 20g of modified seaweed functional water-soluble fertilizer with 20-5-30+ TE nutrients into one beaker, and stirring and standing; adding 18g of macroelement water-soluble fertilizer with nutrient content of 20-5-30+ TE into the other beaker, adding 2g of alkali extraction seaweed after dissolving, stirring uniformly and standing;

after standing for 10min, observation results are shown: the modified seaweed functional water-soluble fertilizer added with 20-5-30+ TE is uniformly dissolved without any precipitation and flocculation phenomenon; adding macroelement water-soluble fertilizer with nutrient content of 20-5-30+ TE and seaweed solution to generate floccules and a little precipitate.

And (4) test conclusion:

the modified seaweed functional water-soluble fertilizer solves the problem of compounding alkali-extracted alginic acid and a macroelement water-soluble fertilizer, and the solution does not have any flocculation phenomenon after the fertilizer is dissolved, so that the modified seaweed functional water-soluble fertilizer is more beneficial to application and absorption and utilization of crops.

Test example 2

Perennial crop grape field testing

Test background: grapes are perennial shallow root crops, the grapes are weak in growth due to high load in successive years, especially for gardens with large ages, large water jug diseases can occur in the grape load slightly, soft fruits of the grapes are caused by malnutrition, the grapes do not have pulp, and the grapes are greedy and not colored in the later period of the grapes.

Test site: malianzhuang town of Lai xi, Shandong province;

test subjects: grapes;

test products: the modified seaweed functional water-soluble fertilizer with 20-5-30+ TE obtained in example 1 and the modified seaweed functional water-soluble fertilizer with 13-6-40+ TE obtained in example 2;

control product: macroelement water-soluble fertilizer with nutrient content of 20-5-30+ TE and macroelement water-soluble fertilizer with nutrient content of 13-6-40+ TE;

test time: 25/8/2018/9/10/2018

Test protocol: half acre of test grapes in each of the experimental group and the control group are fertilized for the first time by using 10 kg/acre of 20-5-30+ TE formula (test product and control product), and 10 kg/acre of 13-6-40+ TE formula (test product and control product) in the second time;

a fertilizing mode: drip irrigation

Observation time: 9/25/2018

And (4) observing results:

(1) after the test group and the control group are fertilized for two times, the growth vigor and the fruit growth coloring condition of the grapes are observed, the lower leaves of the grapes in the test group are dark green and have no obvious aging phenomenon, and the lower leaves of the grapes in the control group begin to yellow and have aging and resistance reduction conditions such as leaf edge scorching and the like, so that the seaweed type water-soluble fertilizer can improve the growth vigor of the leaves of the crops, delay the leaf aging of the crops and improve the resistance of the crops.

(2) The grapes in the test group are basically colored, and the coloring proportion of the grapes in the control group is about 50%, which shows that the modified seaweed functional water-soluble fertilizer can promote the early coloring of the grapes.

(3) 20 grapes are picked from a test group and a control group respectively and weighed, the weight of the 20 grapes in the test group is 140.5g, the weight of the 20 grapes in the control group is 128.3g, the difference is 12.2g, and the yield increase amplitude of the test group is 9.5%; the modified seaweed functional water-soluble fertilizer can improve the crop yield.

(4) The test group and the control group randomly extract 5 grapes respectively, and the sugar degree is tested:

serial number	1	2	3	4	5	Average sugar degree
							Test group	11.3	10.8	12.1	11.5	11.6	11.46
Control group	10.8	10.9	10.5	11.6	11.2	11.0

As can be seen from the table above, in the aspect of the glucose degree, the average glucose degree of the test group of grapes is 0.46 higher than that of the control group of grapes, which indicates that the modified seaweed functional water-soluble fertilizer can improve the glucose degree of the fruits.

Summary of the test: through the comparison of the test results of the modified seaweed functional water-soluble fertilizer and the common macroelement water-soluble fertilizer on the grape fertilization, the method can obtain the modified seaweed functional water-soluble fertilizer, can effectively delay the leaf senescence of crops, improves the sugar content of fruits and simultaneously improves the overall yield of the crops.

Test example 3

Greenhouse vegetable field test in winter

Test background: in winter, greenhouse vegetables grow slowly due to the temperature, nutrients cannot be supplied timely, particularly under the influence of rainy weather, after a period of rainy weather, crops are withered and become fertile, and the plant growth is blocked mainly due to the rainy weather.

Test site: stryker City of Shandong province;

test subjects: a tomato;

test products: 20-5-30+ TE modified seaweed functional water-soluble fertilizer obtained in example 1, 13-6-40+ TE modified seaweed functional water-soluble fertilizer obtained in example 2, 20-20-20+ TE modified seaweed functional water-soluble fertilizer obtained in example 3, and 30-10-10+ TE modified seaweed functional water-soluble fertilizer obtained in example 4

Control product: macroelement water-soluble fertilizer with nutrient contents of 20-5-30+ TE, 13-6-40+ TE, 20-20-20+ TE and 30-10-10+ TE respectively

Test protocol: 20 days in 2018, 10 months, the experimental group is applied with the modified seaweed functional water-soluble fertilizer of 30-10-10+ TE obtained in the example 4, and the control group is applied with the macroelement water-soluble fertilizer of 30-10-10+ TE

20 days 11 months and 20 months in 2018, the experimental group is applied with the modified seaweed functional water-soluble fertilizer with 20-20-20+ TE obtained in example 3, and the control group is applied with the macroelement water-soluble fertilizer with 20-20-20+ TE

In 2018, 12 months and 10 days, the experimental group is applied with the modified seaweed functional water-soluble fertilizer with 20-5-30+ TE obtained in the example 1, and the control group is applied with the macroelement water-soluble fertilizer with 20-5-30+ TE

In 2018, 12 and 25 months, the experimental group is applied with the modified seaweed functional water-soluble fertilizer of 13-6-40+ TE obtained in the example 2, and the control group is applied with the macroelement water-soluble fertilizer of 13-6-40+ TE

Test time: 12 month and 25 days 2018

A fertilizing mode: drip irrigation

Observation time: 1 month and 10 days 2019

And (4) observing results:

(1) when the tomatoes are observed to be in the first cluster fruit mature period, the recovery ratio of the first cluster fruits of the tomatoes in the test group reaches 80%, the recovery ratio of the first cluster fruits of the tomatoes in the control group reaches 60%, the tomatoes in the test group are uniformly colored, and the tomatoes in the control group have green back fruits, so that the selling price of the tomatoes is influenced.

(2) And observing the expansion condition of the second cluster of tomatoes, wherein the second cluster of tomatoes in the test group are uniformly expanded, the shapes of the second cluster of tomatoes are well-rounded, the size difference of the control group of tomatoes is large, and the rate of malformed fruits is higher than that of the test group.

(3) The growth of the leaves was observed and the tomato leaves of the test group grew well because of the recent consecutive overcast days when the control group had developed wilt symptoms.

And (4) test conclusion:

the modified seaweed functional water-soluble fertilizer can improve the capability of resisting low-temperature and other adverse environments of crops and ensure the normal growth of the crops; the fruit coloring and ripening agent can promote the fruit coloring and ripening in advance in the aspect of crop fruits, reduce the generation probability of malformed fruits and improve the fruit commodity rate.

Test example 4

Greenhouse muskmelon field use effect test

Test background: the requirements of greenhouse melon planting on fertilizers are relatively compared, the integral melon fruit swelling period is short, the swelling speed is high, and nutrients need to be supplied quickly in the quick fruit swelling period.

Test site: weifang city of Shandong province (Zhongyao Weiguang city, Shougue city, Zhao Miao city, western vegetable village

Test subjects: greenhouse melon (Elizabeth)

Test protocol: the test group is the modified seaweed functional water-soluble fertilizer with 20-5-30+ TE obtained in the example 1, and the control group is a macroelement water-soluble fertilizer with 20-5-30+ TE nutrient content of other manufacturers and is applied together with seaweed;

a fertilizing mode: drip irrigation

Test time: year 2018, month 3, day 16; year 2018, month 3, day 28;

observation time: 4 and 10 months in 2018

And (4) observing results:

leaf comparison data

Fruit weight comparison data:

comparative data are collected when the growth vigor of the muskmelon leaves and fruits is observed, and as can be seen from the comparative data in the table, the test group is obviously better than the control group in terms of the growth vigor of the muskmelon leaves, and the average single fruit weight of the test group is increased by 0.104kg in terms of the weight of the fruits.

And (4) test conclusion:

the effect of the modified seaweed functional water-soluble fertilizer is better than that of a macroelement water-soluble fertilizer in the use process of crops in combination with the use effect of the seaweed, the modified seaweed functional water-soluble fertilizer is better than that of the macroelement water-soluble fertilizer and the seaweed, the overall growth vigor of the crops is improved, the leaf volume is larger, the photosynthesis is better, and the yield of the crops is improved.

The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made within the scope of the present invention should be included in the patent protection scope of the present invention.

Claims (8)

1. The modified seaweed functional water-soluble fertilizer is characterized by comprising the following components: nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, trace element fertilizer, seaweed, AT modifier and stabilizer; the mass percentages of the components are as follows: 8-51% of nitrogenous fertilizer, 8-40% of phosphatic fertilizer, 20-78% of potash fertilizer, 0.1-0.2% of trace element fertilizer, 2-4% of seaweed, 0.1-0.2% of AT modifier and 0.1-0.2% of stabilizer; wherein the AT modifier is prepared by compounding organic acids and alkylphenol ethoxylates.

2. The modified seaweed functional water-soluble fertilizer as claimed in claim 1, wherein the organic acid in the AT modifier is one or more of 2-hydroxypropionic acid, acetic acid and 2, 3-dihydroxysuccinic acid; the organic acid and the alkylphenol polyoxyethylene are prepared according to the mass ratio of 80-90: 10-20.

3. The modified seaweed functional water-soluble fertilizer as recited in claim 1, wherein the stabilizer is one or two of phosphite ester and neopentyl glycol.

4. The modified seaweed functional water-soluble fertilizer as claimed in claim 1, wherein the fertilizer comprises the following components in percentage by mass: 15-30% of nitrogenous fertilizer, 10-20% of phosphatic fertilizer, 45-65% of potash fertilizer, 0.1-0.2% of trace element fertilizer, 2-3% of seaweed, 0.1-0.2% of AT modifier and 0.1-0.2% of stabilizer.

5. The modified seaweed functional water-soluble fertilizer as claimed in claim 1, wherein the nitrogen fertilizer, the phosphate fertilizer and the potassium fertilizer are respectively selected from urea, diammonium phosphate and potassium nitrate; the trace element fertilizer is a chelated trace element fertilizer, and the adopted chelating agent is one or more of ethylenediamine tetraacetic acid chelating agent, diethylenetriamine pentaacetic acid chelating agent, ethylenediamine hydroxyphenylacetic acid chelating agent and hydroxyethyl ethylenediamine triacetic acid chelating agent.

6. The modified seaweed functional water-soluble fertilizer as recited in claim 5, wherein the trace element fertilizer is an ethylenediaminetetraacetic acid chelated trace element fertilizer.

7. The modified seaweed functional water-soluble fertilizer according to claim 1, wherein the seaweed is alkali-extracted seaweed obtained by an alkali extraction method.

8. A preparation method of a modified seaweed functional water-soluble fertilizer is characterized by comprising the following steps:

step 1: weighing nitrogenous fertilizer, phosphate fertilizer and potash fertilizer raw materials, and respectively crushing the raw materials into 180-230 meshes in a crusher for later use;

step 2: adding water into a reaction kettle, adding alkali to extract seaweed and heating, heating to 50-60 ℃, adding an AT modifier into the reaction kettle, stirring, keeping the temperature constant, stirring for reacting for 10-15 min, adding a trace element fertilizer, and continuously stirring and heating for reacting for 10-20 min;

and step 3: dehydrating and drying the modified seaweed solution obtained by the reaction in the step 2 to obtain a seaweed compound, crushing the seaweed compound in a crusher to 180-230 meshes, adding a stabilizer, and uniformly mixing;

and 4, step 4: and (3) putting the nitrogenous fertilizer, phosphate fertilizer and potash fertilizer raw materials crushed in the step (1) into a stirrer, fully and uniformly stirring, adding the seaweed compound added with the stabilizer obtained in the step (3) into the stirrer, and fully stirring to obtain the modified seaweed functional water-soluble fertilizer.